Concrete
is not the most environmentally friendly material, so any innovation to
mitigate its impact is welcome.Architect and engineer Henry Miller has
developed a process to make concrete using two-thirds granulated plastic, which
it is as strong as conventional concrete.Concrete is usually 60% to 75% aggregate,
consisting of sand, gravel or crushed stone. In Miller's process waste plastic
that would otherwise end up in landfill or heat-related processing, is ground
up and then mixed with pure concrete. This process has the added environmental advantage
of avoiding the use of mined gravel or sand. Bricks made using this process can
withstand 3000 to 5000 psi.